Siemens SIMATIC S5 Manual page 277
Distributed i/o system
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Reaction times in the ET 200 distributed I/O system
t
for ET 200U
slave
Table C-8 Reaction times in the ET 200U
Reaction times in the
ET 200U
t
of a data telegram in
IM 318
the ET 200U
t
between IM 318 and
I/Obus
I/O modules
t
I/O
C-10
t
is the reaction time in the DP slave. As regards the ET 200U distributed
slave
I/O stations, three different reaction times must be taken into account:
Caused by:
When the IM 318 receives a data telegram from the DP
master, it must interrupt serial data transfer on the I/O bus.
During the interrupt, the IM 318 processes the data telegram.
Telegram incoming
from SINEC L2 DP
IM 318 transfers
data on I/O bus
IM 318 processes an
incoming data
telegram
Data is transferred between the input/output modules and the
IM 318 on the serial I/O bus.
The length of this reaction time t
number of I/O modules inserted (or more precisely on the
number of "bytes inserted").
IM
318
The input/output modules have specific reaction times.
For input modules, t
is the time between a signal change at
I/O
the input and the status change on the I/O bus.
For output modules, t
is the time between a status change
I/O
on the I/O bus and the signal change at the output.
For details of the reaction times of the input/output modules,
see the manual ET 200U Distributed I/O Station.
Time
depends on the
I/Obus
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Importance
t
is short when
IM 318
baud rate is high
output bytes are
output bytes are
few, and
input bytes are few
(only at baud rates
> 187.5 kbaud)
Important as number
of I/O modules
increases
Important for analog
modules
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